From b5500b9ca0102f1ccaf32f0e77e96d0739aded9b Mon Sep 17 00:00:00 2001
From: pascal <pascal@openbsd.org>
Date: Sat, 3 Sep 2016 22:46:54 +0000
Subject: Use the space freed up by sparc and zaurus to import LLVM.

ok hackroom@
---
 gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp | 55 ++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp

(limited to 'gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp')

diff --git a/gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp b/gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp
new file mode 100644
index 00000000000..3f60e18fafa
--- /dev/null
+++ b/gnu/llvm/lib/CodeGen/StatepointExampleGC.cpp
@@ -0,0 +1,55 @@
+//===-- StatepointDefaultGC.cpp - The default statepoint GC strategy ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a GCStrategy which serves as an example for the usage
+// of a statepoint based lowering strategy.  This GCStrategy is intended to
+// suitable as a default implementation usable with any collector which can
+// consume the standard stackmap format generated by statepoints, uses the
+// default addrespace to distinguish between gc managed and non-gc managed
+// pointers, and has reasonable relocation semantics.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Value.h"
+
+using namespace llvm;
+
+namespace {
+class StatepointGC : public GCStrategy {
+public:
+  StatepointGC() {
+    UseStatepoints = true;
+    // These options are all gc.root specific, we specify them so that the
+    // gc.root lowering code doesn't run.
+    InitRoots = false;
+    NeededSafePoints = 0;
+    UsesMetadata = false;
+    CustomRoots = false;
+  }
+  Optional<bool> isGCManagedPointer(const Type *Ty) const override {
+    // Method is only valid on pointer typed values.
+    const PointerType *PT = cast<PointerType>(Ty);
+    // For the sake of this example GC, we arbitrarily pick addrspace(1) as our
+    // GC managed heap.  We know that a pointer into this heap needs to be
+    // updated and that no other pointer does.  Note that addrspace(1) is used
+    // only as an example, it has no special meaning, and is not reserved for
+    // GC usage.
+    return (1 == PT->getAddressSpace());
+  }
+};
+}
+
+static GCRegistry::Add<StatepointGC> X("statepoint-example",
+                                       "an example strategy for statepoint");
+
+namespace llvm {
+void linkStatepointExampleGC() {}
+}
-- 
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